F(1) = for i=1, f(0) + f(-1) +pf() = 0+0+1=1 printf call
for i=2, f(-1) + f(-2) + pf() = 0+0+1 =1 printf call
F(1) = 1+1 = 2
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F(2) = i=1, f(1) + f(0) +pf() = 2+0+1= 3
i=2, f(0) + f(-1) +pf() =0+0+1= 1
F(2) = 3+1= 4
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F(3) = i=1, f(2) + f(1) + pf() = 4+2+1 = 7
i=2, f(1) + f(0) +pf() = 2+0+1 =3
F(3) = 7+3 =10
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F(4) = i=1, f(3) + f(2) + pf() = 10+4+1 =15
i=2, f(2) + f(1) + pf() = 4+2+1 = 7
F(4) = 15+7 = 22
Answer 22 times